Saw-sharpening machine.



J. MIOTKE.

'SAW ISHARPENING'MACHINE. APPUCATION HLED omao. m2.

Patgnted Oct. 26, 1915.

I 2 SHEETS-SHEET I.

mum-- :oumnu Pqmmuwl 10.. WASHINGTON. n. c

JQMIOTKE.

SAW SHARPENING MACHINE.

APPLICATION FILED UEC.30, 1912- 1,157,890. v?-

l2 SHEETS-SHEET Z.

onumm rumccurn 0-. WAsHINqTnN. n. c.

Patented Oct. 26, 1915.

1. MIOTKE. SAW SHARPENING MACHINE.

APPLICATION FILED DEC-30. 1912.

1,157,890. Patented Oct. 26, 1915.

J. MIOTKE. SAW SHARPENING MACHINE. APPLICATION FILED 020.30, 1m.

Patented Oct. 26, 1915.

12 SHEETS-SHEET 4.

COLUMBIA rumour" 60.,vusmm-rou, n. c.

J. MIOTKE.

SAW SHARPENING MACHINE.

APPLICATION FILED DEC-30, I9IZ.

Patented Oct. 26, 1915.

I2 SHEETS-SHEET 5- J. MIOTKE.

SAW SHARPENING MACHINE.

APPLICATION FILED 020.30. I912.

12 SHEETS-SHEET 6.

b 2 PP Patented Oct. 26, 1915.

J. MIOTKE. SAW SHARPEINING MACHINE. APPLICATION men 050.30, 1912.

1,157,890. Patented Oct. 26, 1915.

12 SHEETS-SHEET 8.

mm" Fl J. MIOTKE.

SAW SHARPENING MACHINE. APPLICATION FILED nc.30. I912.

1,157,890. Patenwd Oct. 26, 1915.

12 SHEETSfSHEET 9.

coumnu muocnm c0. WASHINGTON. n. c.

J. MIOTKE.

SAW SHARPENING MACHINE.

APPLICATION FILED DEC. 30 1912. 1,157,890. Patented Oct. 26, 1915.

a L 22 SHEETS-SHEET l0.

9 5 m 8 111. m b

coumum PLANOnI-A N 60.. WASHINGTON. n. c.

1. MIOTKE.

SAW SHARPENING MACHINE. APPLICATION FILED pc.30. 1912.

Patented O0t.26,1915.

12 SHEETS-SHEET I I.

COLUMBIA Moamum co wAsmuarou n c 1. MIOTKE. SAW SHARPENING MACHINE.

APPLICATION FILED DECJO. I912 Patented Oct. 26, 1915.

I2 SHEETS-SHEET I2,

JOSEPH MIOTKE, OF LIILWAUKEE, WISCONSIN.

SAW-SHABPENING MACHINE.

Specification of Letters Patent.

Patented Oct. 26, 1915.

Application filed December 30, 19-12. Serial No. 739,299.

To all whom it may concern:

Be it known that I, JOSEPH MIoTKE, of Milwaukee, Wisconsin, have invented a Saw-Sharpening Machine, of which the following is a specification.

This invention relates to devices for sharpening and gumming saws, more particularly hand-saws, and the object which I have in view is to provide a machine which will perform the complete operation without the aid of skilled labor and with greater mechanical accuracy than can be obtained by hand or by means of those machines in which a part of the movements are manually guided and therefore require a certain amount of manual skill.

In sharpening a saw there are three principal essentials to securing a perfect adjustment: First, the teeth must be filed at the correct angle; secondly, thepitch or distance between any two teeth must be exactly the same as between any other two teeth; and thirdly, the points of the teeth mustlie in a straightline or (as is more usual) in a long arcuate curve of 28-foot radius. The first point involves two others, namely, the proper angle of the front edge of the tooth with the direction of sawing and the correct diedral angle of the face of the tooth with the plane of the saw. If any one of these several essentials be imperfectly carried out, the saw will not cut properly or perfectly, depending on amount of the lackof adjustment. Hence, it is clear that it is impossible to perfectly cut the teeth by merely manual skil even where a. guide is used for the saw-file as in some existing machines, and moreover this requires skilled labor and takes a large portion of carpenters time each day in sharpening their saws.

I therefore have in view to provide a machine which, on large work where many carpenters are employedgcan be operated ,by an unskilled hand to continually sharpen saws while the carpenters are entirely relieved of the operation, and further, a machine for use in factoriesto turn .out saws more perfectly edged than is possible with the apparatus heretofore employed.

I also have in view to provide means in connection with my machine for gumming the savv that is to say, punching out or repunching the teeth of the saw to a fixed and uniform size whichshall be accurately regulated by the machine in the same Way as the filing is regulated.

My invention embraces in its construction, first, a baseframe havlng a clampmgdevice to which a saw can be rigidly secured;

adjusting-gages and devices, for adjusting the position of the saw in the clamp vertically and horizontally; a carriage traveling on said base-frame; means for exactly ad justing the travel of said carriage to the pitch of the given saw-teeth for each revolution of the operating shaft; an oscillating filingframe detachably mountable on the carriage; an oscillating gumming-frame detachably mountable on the carriage and adapted to be substituted for the filing-frame and to perform similar movements with the exception that the operation performed by it is gumming instead of filing mechanism on the carriage for raising and lowering the filingframe or gumming-frame (as the case may be) automatically as the carriage advances: means for causing the file or gumming-dies (as the case may be) to follow in its path the curve of the edge of the saw; devices on the carriage connected with the filingor gumming-frame (as the case may be) for reciprocating the file or punching-die; devices for automatically reversing themovement of the carriage at the end of its travel, for causing the tool to skip one tooth at each such reversal, and, in the case of the file when used on a saw having alternate teeth filed at opposite diedral angles, for reversing the angular position of the file ateach such reversal of the carriage; adjusting devices for different styles, angles and pitches of teeth of different saws; and novel combinations and subcombinations of elements for accessory purposes, as will be hereinafter described and more particularly set forth in my claims.

The nature of my invention will bestbe understood from a consideration of the accompanying drawings, which show, the most improved form thereof. The first twentythree figures of these drawings illustrate the machine as provided with the filing-attachment; the other nine figures illustrate the gumming-attachment.

Of the several figures, Figure 1 is a plan view of the complete machine, a part on the right side being broken out to bring the right-hand end within the limits of the sheet; Fig. 2 is a front elevation of the carriage and a portion of the frame adjacent thereto; Fig. 3 is a fragmentary front elevation of the parts shown at the lower left- 18 '(Figs.

hand of Fig.2 with the ratchet feed-wheel removed; Fig. 4 left-hand side frame being shown in section;-;Fig :1 is a is a side elevation from the similar elevation from the right-hand side,

of-thecarriage, thebase-frame being shown in section; Fig. 6 is a longitudinal section through the carriage on the planet (Fig. l) Fig. 7 is a plan ofthe shifting camplate' which actuates the shiftinghead of the file-carrier; Fig. 8 is a perspective view of the shifting-head of thefile-carrier; Fig. 9 is a transverse section through the carriage taken on the plane 9 (Fig. 1) and look-- view of the file; Fig. 16 is a perspective view of the carriage feed reversing-elements; Fig; 17 is a fragmentary longitudinal section on the plane 17 (Fig. 1), looking from the rear and'showing'portions of the carriagereversing mechanism in the act of reversing; Fig. 18 is atrans'verse sectionthrough the carriage and framefon. the broken plane of the v arrow and illustrating onlythe c'arriage-clalnping devices; Fig. 19 is a longi tudinal vertical section through the front portion of the carriage on the plane-l9 (Fig. 2), illustrating onlythe construction of'the ratchet feed-mechanism. Fig. 20 is a perspec'tiv'e'view of the ratchet'feed p'a'wl; Fig. 21 is a perspective View of the crank for manually advancing the carriage; Figs. 22

and 23 are perspectively views of the interengagirig cam-devices for shifting the opcrating shaft longitudinally. All the foregoing figures illustrate the machine with the parts assembled for'filing; those following illus'trate'it as and of these Fig. 24 is a plan view of'the carriage and part of the base-fra'rn'e; F

25 is" alongitudinal central section" thereof looking' toward the1eft;Fifgs."2'6, 27 and'28 are perspective views 0 h Pu c -die and of. the latter, respectively Fig: 29

tail pi'ece' is a side'elevation from the left's'ideof the gumming frame and a portion of 'the ear riage, showing the formerinl'raised posi tion; Fig. 30 is a rear elevatien of certain driving-parts at the right of Fig. 29, the

supporting portion of the carriage frame being shown in section on the-axis of the driving-shaft; Fig. 31 is a front end view of the gumining-frame. as seen in Figs24 32 is a transverse section and 25; and Fig. v 4 thereof taken in the plane of the'sawf In of the carriage, the base land 2), looking 'inthe directionprepared for 'gummin'g;

alone the file is shown in the central or right angle-position;

figures, in the acuteangle position of advancetowardthe right of Fig. 1.

The reference letters refer each to the same-part-in each figure of the drawings. 1; The machine comprises, first, a generally rectangular"base franie designated A, which is stationary and rests on any suitable support; secondly, a carriage, theframe where of is designated B, running on said frame from end to end thereof, as shown in Fig. 2; thirdly, a driving or operating-shaft C turning in bearings a on the frame, and having a hereinafter-specified engagement with the carriage for the purpose of moving itfr'om end to end and operating the various mechanisms carried thereby, said shaft C being providedwith adequate means for revolving the same, crank 0 mounted on the overhanging lefthand end thereof and provided with a handlepc fourthly, a saw-clamping and supporting mechanism, the same comprising a longitudinally adjustable stationary element or fixed-'jaw D and a movable clamping-jaw E, between-Which, in Figs. 1 and 10, is shown clamped the saw F; fifthly and sixthly, a filing frame O and a gummingframe Y; with appropriate connections and features, each of which will be described in order. p V

' v be base fra'ine A'and the coacting sta' gear'G whi'ch is'pivoted upon a stub-shaft 9 carried by the carriage, and iti s" actuated by the feed-mechanism which is illustrated in detail in Fig- 19 and will now be de scribed. The Qhee'l G has projecting from falong sleeve 9?, which itself turns freely "upon the shaft 9 and has mounted thereon several elements, one of which,a rock-arm H, is keyed thereto by twofpinsfl passing-through the extended hub fi thei eefjfThe members G and H therefore turn teg ether'as one piece, freely p n Shaf v placement bya' washer and nut g mounted on a threade'd'st g The'hub 72. is cylindrical and adapted to receive the ratchet'feed-wheel I, which so that thereis no lost 'I'netion between them;

but the other hole, 'i ,"is"elongated' in a cirin the remaining here represented by a b'eing 'h'eld against dis 11d. on theend of shaft runway e jis also secured a rack a? with which engages a spurhave an amount of lost motion exactly C0rre spending to the distance betwveen-t voiteethon. the saw which is being filed. The ratchets wheel ,Ixis removably held in place upon the. arm, H by aforked spring-plate 6 the legs of which are received in an annular-groovec h in the, hub hf, sothat the wheel I canbe instantly-c removed I by withdrawing this plate and a wheel of another size put lIlyltS:

place; or when it is desired to advance the carriage by hand, the wheel I is replaced by hand-crank J, having cylindrical holes and 3' adapted to fit the hub 71, and lug h respectively.

The mechanism for feeding or advancing the carriage step by step, each step being equal to the pitch of the saw teeth, or double the pitch, consists of a double-nosed ratchetpawl K pivoted upon a pin passing through the end of a swing-arm k and freely movable therein. The pink has the pawl K keyed on oneend and a double armed dog 10 keyed on the other end, so that the two swing together. Thedog I0 is for the purpose of reversing the position of the pawl as will be described later. The pawl K is adapted to feed or advance the wheel I in, one direction or the other according as it stands with one nose or the other in contact withsaid wheel, and in each :of

these two positions it is resiliently maintained by a conical-ended pin ktwhich'is seated in a recess 70 in the swinging arm 70?, and is pressed against the back faceiof the pawl, Kby a coiled compression-springja behind it. The back face of the pawl has two depressions 10 on opposite sides of the centerline, so placed as to receive the conical end of the pin 76*, said end being seated in one, OILOtllGl depression according to the positionof the pawl and give to the pawl suflicient resiliency to click over the teeth of the ratchet-Wheel I. 4 I

The swingingarmk is reciprocated, that is to say, given, one forward and one back-v ward stroke, for each revolution of theshaft C by the, following mechanism: Theshaft C ha sfalong the greater part of its lengthsa groove or keyway c Journaled upon the carriage-frame B, inlugsbikandb thereofv (see Fig, 9 is a member ,L, which=\ ke Z enga in in the. keywa c ,'.so that,

y g g y the rotatiomofthe shaft causes the member L torotatebut leaves it free to slidevalong the shaft.The member L carries aspurgear Z and a bevel-gear Z the latter engagcam m which has init a groove m (Fig. 2) of, suitable shape to reciprocate the swingingv member cm, which is plvoted-hl'ponia pin b von the carriage-frame, and has jour-.

naledthereon a bar m turning on a pin m 1 andcarryingon its ends two cam-rollers m wh ch move in said cam-groove m 'It, is

not essential that there shouldbe tworeamrollers, but these are provided to give greater smoothness of action The swinging membenmtis connected with the swinging-arm k by a link m journaled on a pin k on said'arm and on another pin m which is provided with a screw-thread adapted to screw into any one of a set of holes m in the member m said pin m, being also provided with a winged head as shown for readily removing and resetting it. Opposite the holes m?" may be placed index numbers m which correspond, to the; holes and indicate the points per inch of the saw which is to be sharpened. Now it will be seen that the arm I0 and hence thepawl Kr will be given a greater or less'amplitude of swing according as the pin m? isset in one ,of the lower or upper holes ,of the member 1 m Such different amplitudes, of swing correspond to the respective pitches of a set of ratchet-wheels 1, similar, in shape to the one shown in the drawings butzhaving each a special pitch corresponding to the different saw-pitches.

The actual filing of the saw comprises two movements: one to advance and retract the file, the other to raise the file from the saw on the return-movement and lower it on the advance-movement. Both .are operated vby means of a shaft N, whichis continuously driven by aspur-gear n engaging with the gear, Z and having the same size, so that each revolution of the shaft C is accompanied by one of the shaft N. J ournaled on the frame B of the carriage, and on a pin b I passing through two upstanding-lugs 6 at opposite sides thereof,-is an oscillating frame 0 herein termed the filing-frame in contradistinction to the gumming-frame described a later. The frame O is generally A-shaped as shown in Fig.1, having at its apex theIfile-V ing onesleg 0 extended to proximity with the shaft N and provided with a cam-roller .oflwhich is engagedand depressed once in each revolution by a cam n on the shaft'N. Thiszgives the frame 0 an oscillating move- :ment, raising it mechanically and permitting it to drop by gravity. In order, however, to

assure the depression of the saw-file to the gage-limit during the filing-movement,- I

.prefer not to depend upon gravity alone zbut'to positively depress the frame 0 bya ing with the beveled gear-teeth m ofgamem- 1 spring 0 pressing against a conical cap or end of the spring 0 is seated upon a-recipro-v eating seat-membervo;.(Fig-. 5), Whichhas a:-

pin 0 passingathrough a hole inlthe frame the front end 10f the filing-frame I 0; thus bringingthe pressure of the springto' bear" only in the depressed position of the 'file' oi tool-. v n t i i The file in my machine;-- P, shown sepa-' rately in Fig.'15',is of= special shape-adapted to be received in a ho1der =Q,;2which latter" reciprocates inQa' shiftingiiead R journaled in ithe apexed front end of th'e *fran1e'-'O so that the; filef and its holder ca'n befheld-zei ther in a position at right angles iwith' thej sewblade"; which would be suitable 'for a nseam onat an acute-angle with Y the planethereof, which would i be "suitable for a cmss'cuesaw' the acute-angle being I alternately on one side andone thew other of the blade. The -file'-' holder" Q} is 'constructed with two" i parallel bars 9 sliding in sockets 1' (FigsK8- a'nd 12) and'iconnected at their: ends '-"byheads 9 which provide also journals to receivetWo chucks 9? 9 ,11 these latter being accurately: in 1 line. and being provided with so curatlyi centered bores to receive'the turned 1 end szpk .=of the file 1 #It is essential to i the corriecti 'w-orkingazozfi the n'iach'ineptha't the centering ofxthe chucks; and also the cente ingio'fwthe file-journalsif on th'e file P, be

accurate & saidv journals @being turn'ed as' shown soiasito; be coaxia' with the fil'e itself; 4

Which 'a're exten-=- sions==of the filingsurfaces=oii the file g 'Ih'e object oftheseiflats-lp is to itheifi l'ei P chewsgiq in such exposition{thatvtheguppemsidiqf the file shall Ebe aocurately horizonta'hin ethos word's so that :the twoiifielin'g sides ana yfonm 'requal and having three flats;

to be :clipped: Joy means Ofset angles with nivertical planet-3111111 this inan-ne'r samea-positionswit-h respectz to,= the aw; no

thevpo'inter for; filing Ma rip-saw; 5 im it'hich' I the. upper face of thei file is1tipped thYongh anaangle of about :30 rQther -manksfimay'soi .w

- three different "positions as course, if desired; be provided to showdifferent angles at which the faces of the file i areto be setfin case it is desired to use any" other angles, or thedisk -gn1ay be regularly graduated in degreesi dn order to hold the chucks 9* and g ginthep'ojsitions in V whiclrr halves of whichredrawn together upon'the ChllCkS by 's cre the shaft N and a link 9 connecting said crank with-the head-g there being balljoint end-pieces 9" 'on each end of the link because the. holder Q, has the angular shift- 1 ing movement hereinafter 'referred to. F urthefi'in order to form a Behring for the head} Q3 againstthelateralthrust of the link When-the file stands at =anangle: to the saw, I provide an upright post 59116 ({Figs;1,-2 and 6):.inountd onasaid head g an'd c'arrying a roller g: which :rolls upon one of thetwo rails 0? formed on the frame-O. The

ball-endedcranlcpinvql g which connects the crank n-iwith the' -linkg and forms the other member of the ball-joint, is provided with a screw-stud q 'pa-s'sing through a hole in the crank and a nut q by which it is se- 'cured'thereto so that in removing the fil ing+fra1ne this pin g is removed along Wit'liit. a

The shi fting-.head is arranged to hold the Fangle iof the reciprocation of the file in aforesaid, narne'ly3 at right angles tof'the saw-blade and at 5 an acute r angle therewith on opposite 1' ;fthe shaft 4 which is journaled in the a collar 74" mounted 1 oin-the upper end of sides o'f'the right-angle position; Theshift ingI-Jhead'R"comprises-:(Figs; 8 and 12) the I plater which cari i es the parallel" sockets 5 the shaft r and secured theretoby a s'etg screw r The collar r has a hub s'leeve W adaptedi-to engage alternately with two lugs I 7' won? Sopp'osite side'sj of theco'llar T and i hasfurther a sphericalflug r i=atcne{side of the pivot-,1 with which is I connected the' ballointend-piece r of a 1ink'1 t he purpose EOf which'is'tothrow said shifting-plate over shown, has three amarks i20 apart ilesig-= nated' Cf 'i n each "of: which thempper face ofthe. file is horizontal? these indicating the-r": positions; of the ppinten fr' filingwcrosscuti saw; and three similarly spacedimark's desig nated Rf which indicate 'the ipositions of in-the manner hereaft'erenp lained. In "the front-end of the plate 'r are formed two hol es r which subtend with the axis of the shaft W t-heanglethrough which the shift- 7 ingh'ead' R;;holder Q an'd fi'lefP are shifted iii passing from one acute-angular position to the otherz in-other iiivorld's, double the )angle'which hefile makes with the plane f' zof thegsawi 'With these hdles r engages a with a collar 1- seated in a recess a, and

a coiled compresion-spring r is placed [behind the collar r"- to force the pin into one of the holes r whenever it reg- '-isters therewith. The upper end of the pin '1' passes'through an arcuate slot r in the plate r',-and it carries a head r above said plate, said head being preferably milled so that the pin 1-" can be conveniently raised when the head to be shifted manually.

For shifting the head automatically, the plate 1- has at each end of the arcuate slot 1-" an oblique camsurface r, which is adapted to engage the bottom of the head 1-" and raise the pin 1' out of one'of the holes 1 whenever the plate a" horn one side to, the other, and for this purpose 'the 'of its p 'vi ed,'since the file occupies the same gods 1- head r" ispreferably given a curved on its lower end, as shown in Fig. 6.

It will be observed that between thetw'o cam-surfaces 1- on the plate 1'' is a fiat space, during the pasage of which under the head of the pm 1' the latter is held raised, and it is during this intervalthat the projection r acts on one of the lugs-r to shift the head through the desired angle. In other words, the shiftingis effected by moving the plate 1'" from one of its travel to the other, which effects the following series of movements:' The cam 1" on the plate 1" first raises the pin 7' out of the'hole 1-" in which it is seated, which time the head B is stationary. When this has been effected, the tprojection 1' strikes the lug r during e remainder angular movement turns the head'R, file-holder Q and file P with it, this movement continued until the pin 1-, drops into the opposite hole in' which positionthe parts are then looked untilthe (r-movement is reversed. I "For holding the fiie in its iniddle or rightposition no shifting'movement tionfor all the teeth. The shifting' n'is locked in this position by means" oftwo 1, 4., 8 and through the-aperturesinboth. Thispinfi other positionpinwhich the locked fast to the automatic msxn, from which of course'it'necessary isshown in the as occupying anr" ise "to unlock a when'in' the-right-a ngle 'tion previously indi As it 'will be undersfood as; is absen saw hassuccessive filed at opposite angles; it would neces'aiy if the succesi ive teethfwcrein order thatthe-a'ngular t e should reversed. t eachstroke. order'te avoid the necessity for which the rforated' lugs a" r (Figs anda' pin r, which placedfore, miorder that the machine may be per fectly automatic, to provide means at the end of the forward movement for, first, shifting the angle of the file, secondly, reversing the direction of feed, and thirdly giving the carriage an initial advance 0 only'one tooth instead'of two. teeth, which is .the normal feed of the carriage. These means will now be described.

, The primary reversing devices are trated separately and. more'particularly in Figs-16 and 17. A main reversing-shaft S extends from frontto rear of'the carriage, and is supported in bearings on the frame B, a lug 6" being provided at the front end of the carriage for this purpose. On the front end of the shaft S is mounted a rockarm 8; and on the upper end of this arm,

upon a pin 8, are pivoted twof extensionmembers thereof 8, having each a platenshaped end as shown in Fig-16. These extension members s extend laterally to opposite 'sides'of the arm S, and have abutment heels 8 'which'limitf their upward movement; and a stifi -spring 8. is provided, the middle of which is supported on a screw 8 and the two ends'pres u'p'npon the extension-members .sr" so as' to hold them in their raised positions. At opposite ends of the runway 41 are placed two shiftable blocks 11 secured in adjustable positions by bolts (1 pa'ming through slots din the runway. These blocks dsupport dogs-d which are pivoted at d; each dog having a platenshaped finger d which extends a certain distance toward the carriage. The other end the extension-members s but not low enough so as to.touch these members. Therefore thefoperationof the reversing-shaft 'will not be efiected'thereb until the carriage has reached the end o its travel, where one of the bals' 0 will, in its vertical oscillation, strike the finger d of the-corresponding dog 1, depressing this finger, and the latter in turn strikes the end of the "extension-member s which is immediately'under it, thus throwingthe rock-anus and the' shaft S over in that direction, namely, to the fopposite side from where itwas. reversal of the shaft will take place at each end of the travel of the carriage. The spring a, it

., increment of the. shaftshould be observed; is stiff enough to prelyent the extension-membera from turning 'on'ifs pivot; sF-during such reversal, but jieldsin case. the. downward movement of the bar carries it. begond the. limit of v for which fixed sbo hereinafter described; are provided. the rear end of theshaft-S' is a seefrond rock-arm a whic-his connected by a a to? a third rock-arm a, which is mounted-upon and secured to a rock-shaft sTjourn'aled in a pair of lugsb of the carriage. The rock-arm s is'also connected by alink t to a pin t on a cam-arm T, which is journaled upon the sleeve of thes am It, as shown in Fig. 19. .The upper end .of 'the cam-arm T is provided, as clearly illustrated Fig. 3, with a curved camedge t, whose'function is to engage one of the two legs offthe dog k so as to throw over the pawl K from one side to the other f and thereby reverse the feed of the wheel I 4 as previously explained- The rock-shaft 8 is provided onits opposite end, as seen more particularly in F igs. 5 and 9, with a swinging. arm n} which engages in a groove u of a sliding-block U, block being keyed in aslidable manner-to the shaft, C in the same ;manner asthe member L. The block U a reversal in theother carries a wedge-shaped reversing-cam u, the ofice Of'FhlOh 1s'=to engage on one side or the other, a cam-roller u mounted on a pin u on the end of a rock-arm u ,b .a rock-shaft If, and throw these parts over in the .correspondinghdirection. The shaft u 'is vertical and journaled in lugs 6 on a. post 6", which is secured to and forms substantially a part of the carriage-frame B. On its upper end the-rock-shaft 11- carries another rock-aim u which is keyed thereto, and on top of that a longer arm rfiwhich is loose thereon and is kept in place by a collar 24 on the end of the shaft. The rock- .arm f has onits end-a spherical lugr, which articulate-swim a ball-joint end-piece r on the rear end ofthelink e i T m Ti $21 1 ringperorationswfc are y the pin r",..andas previously indicated this pin is. in these perforations to lock the two arms t ther wheneger the saw-file is be worked In the Limiting stlops'fb" an 6 the former on the frame. B in positionto be struck by thearm' u 'on the reversal in'one direction thejatteron the base of the member'b in to bestruckby-the arm s' on the direction, are provided ffofi eg ifi e d the train of elements optherebjn; includingthe cam U and n adame b ca f h arie e of the frame 'Q (he'reinafter ha t e. the complete reversal of the file, a supported free of the bar V r, Thetwo' shaft S, and any excess above said is taken up y th p s It iswell understood that the edges of hand-saws are generally made not a on a straight line but on an arc of large radius.

order to provide for this curvature it is therefore necemary that the file should travel, not in a straight line. from end to end, but on a corresponding curved line. To provide forthis, I have rovided my machine .vvith a guide-bar secured to the inner side (if the front of the frame parallel with the position of. the saw, the upper edge oi this bar givenja curvature exactly identical with that which the saw has or which=' it is intended to give -it..- With this guidefbar cooperates a lever v pivoted upon the pin p" mounted in a-pair of depending lugs. 6. carried by the frame B,-this having a-nose zfiwhich is-adaptedcto rest upon the bar during-the travel of the carriage.-- The lever a is provided with an upright extension "0?, the upper end-of which is directly beneatht-he-end of a set-screw a" mounted in a threaded lug 0 on the frame 0 and locked in place by a wing-nut o". It isobvious now that the striking of the setscrew 03'' u p n the end of the extension '0 the epresion of the frame 0 during the filing-movement, and. thereby the file is caused to follow in its movements the Shiite of the upper of the bar V.

caseswhere itjs desired to have the straight edge, the member 2: is by mea 1s of a re a in 1, which in being shown as inplaee in'the-dra When the lerer v is not inusethe pin '0 y be placed .for safekeeping in any con- Tenient aperture 6" In order. to preventthe carriage from being moved by the reactio'nof the file during the operation, I al'so provide a clamp which yflsecure's the carriage to the base or bed ofthe' machine while the fileis advancing, releasingit again atthe end of the movement'of the file so as to 't the carriage be advanced by the eedemechamsm during the return-movement of the filei This cIamping device, illustrated particularly] in Fig.118, comprises a cam W actuating. a 'cam-leveri-w, which. is pivoted at w? on d e inner -sid'eof the carriage-frame, and carries a rollerapi which is g ged by the,-.in.ternal cani-edge 'w .of the cam, thls extending half-way around the cam so that during this interval the lever 12: The has the effect that the heel w thereof presses upon a short pin 10, which is loose lever of the lever 10" m a itavity' in the fifame B, and forces it ,out.

On the outer side of the frame" andv upon mph 6? on a -block b? on the frame is" pivoted the clutch-dog 30'; whose I thejcemsurfece cton a coller' whichisse-' a. 1 The. arrangement is, of

shaift' back to its previous position. The

cams-a and 1c? at theleft oflFlg, 1 are active l during: the movement of the carriage from left to right, while the cement the other end i-nre inective; -endrvice verse when the carriatgeis trnvelingin the oppositedirection. I y will now; describe the means whereby the se F is set .aInd clamped' nt .the'correct -.height, and also how theareversmg-dogs d are ,setuto cause reversal of the'cerriage at the end-of the saw.

Onreiach er the shi ftable blocks is an upright post 03", on which 1s pivotally mounted esgaged, the pivot of said gage being at, c midway of the post, while. the upper end of the post has a. spring-pin d, the end ofxwhich is adapted to enter either 5 of. two perforations-d? in the gage and ftherebyrhold the g'eg either in the full-line -ior.dottcd-line position of Figs. 10 end-1:.

.The endfiof the gugejd is providediwith n chisel-edged point-(i 21 which is so sates to --give exactly the right heightfo'r the sewand'the pointis-s'eeted between two teeth. The fixed jawD of the sew-elem has a yoked extendingnround the move le jaw E, a-ndn psir of depending ears d czrrrying pivot-pins fl", on which turn the pivotesrse of 'the movable jaw E. Each of the h jaws D and E' is preferably provided with a wooden beering face, designated respectively cl and a, The means for'pressrng up themovnble jaw E against the fixed ew consists of a )lurelity'of set-screws d? turning .in' three ed apertures in the yoke d and pressing ageinstlthe'headsof slidingpins d which 'ressdirectly a ainst the beck of the jaw f, In order to old these 5Q erably inserted: between the end-of each shscrewsf tight, n cushion-Spring(I is prefs'crew and its pin 'd", This provides that when, for example, the middle screws have beenjscrewed upgthey shall'not become loose when the other screw are screwed u afte'1'- ;wa;rd,.due to'yieldingof the'yoke In addition to -'fthe permanent cleniping mesins just described, temp orery clempmgmeans are provided-sothet the saw can to dioldi'tup'i whileiitiis being edjnste'd in position Sueh'n1eans' compr1se an arm e on its'end'n roller 0, and a swing ing' clirmp-leveric'l? pivotedat d? on the ied'ge of the yoked ysnid lever being projtion shown in the drawings, to draw c nnd pushes it down 'the jaw E open.

' set-screws a beerin vided with an inclined cam-edge d adapted,'when the lever is turned into the posiup the erm e and thus clamp the saw in the center, n'ssilming suflicient flexibility in the jaw E sonsnot to hold it firmly at the ends. In

this position the saw can be shifted until it isnccursitely set by means of the as previously described, and the c :unpingscrews (1" are then turned up to hold it firmly in its position. When the saw is to be removed after releasing the screws (1, the jaw E is withdrawn from the sew by throwing the lever cl over to the opposite side of the arm 0, where a second czunsurface d? comes in contact with the roller end thereby throws To further provide for'setting the saw so that the file shall be adjusted correctly to the edge of the teeth an endwise adjustment is provided for the elznnpin -frame D; this frame being arran ed to s ide upon the frame A, the bolts which hold it in place being arranged tomove longitudinally in slots (Win the frame A (Figs. 5 and 17). v A is provided at its ends with Screw-threaded lugs a, in which are placed a ngnhist depending lugs d" on the ends-of the frame D.

It will be understood of course that before the actmrl filing begins the gages d are to be thrown up into the raised position shown giFig. 17, so as to be out of the way of the When it-is desired to gum or punch out the teeth of the saw the filing-frame O is removed by extracting the pivot-pin b on which it turns, removing the collar 11. from the end oft-he shaft u and also the rockerm 1' which is connectedwith the pit-men 1*; and removing also the crank-pin by taking ofl? the nut q. The gumming mine Y (Figs.- 24 to 32) is now. inserted in place thereof. This frame, for the purpose of ndjustmenhng hereinafter explained, is not mounted directly upon the pm I) but upon a, hollow eccentric sleeve 3 which is pcrfo- "rated as shown to receive the pin 6 and extends 'bctween the standards 6 The axis of the sleeve y lies immediately below that of the pin b, but in the course of adjustment it is shifted back and forward to n slight extent by the means hereinafter de- .scribed. On this sleeve is mounted, first the frame Y by means of a pair of lateral cans g fand secondly, the walking-beam 2 which transmits the movement of the crank it to the punch-holder Z and punch z".

The punch-holder Z is of: cylindrical form and is arranged to reciprocate in the hollow bore'g of the frame Y, and it is connected by a pin z to one of a pair of toggle-links z, 2 the latter of which is pivoted on a stationary pin a mounted betw en the two 

